Can I Be Excommunicated From the LDS Church For Being Re-baptized?

Yes, you can.

It has been reported that Handbook 1(reserved only for use by Priesthood leaders, changed frequently, and not available for public consumption), Section 6.7.3, reads as follows concerning the LDS Church’s definition of apostasy:

[A]postasy refers to members who:

1. Repeatedly act in clear open and deliberate public opposition to the church or it’s leaders.

2. Persist in teaching as church doctrine information that is not church doctrine after they have been corrected by their bishop or higher authority.

3. Continue to follow the teachings of apostate sects (such as those who advocate plural marriage) after they have been corrected by their bishop or higher authority.

Many leaders interpret this to mean that no ordinance may be done without sanction from LDS priesthood authorities. Our various posts have proved, according to the scriptures, that such an interpretation of this policy is against Christ’s teachings, and that the definition of apostasy listed above contradicts the scriptural definition of apostasy (see Mosiah 26:36; Alma 6:3; and Moroni 6:7). The LDS Church does not have a monopoly on righteous priesthood use (see here). When they insist on such a notion, they prove they are exercising “unrighteous dominion” (D&C 121:39), since they only have jurisdiction on who performs Priesthood ordinances within official Church meetings only.

Because of the persistence of this overreach, and for other reasons we’ve outlined (see here), the LDS Church has lost all rights to claim it is collectively led by the Priesthood of God. They have a fellowship among themselves, but to use scriptural language, they have cut themselves off from the presence of the Lord (2 Nephi 5:20) inasmuch as they have rejected his servants, the prophets (D&C 124:8), the chief among those they have rejected being Joseph Smith and the Lord’s teachings through him in their own scriptures (D&C 64:39). They shall be their own condemners out of their own mouths. Joseph Smith described such a situation as the definition of hell:

The great misery of departed spirits in the world of spirits, where they go after death, is to know that they come short of the glory that others enjoy and that they might have enjoyed themselves, and they are their own accusers. (History of the Church, 5:425; from a discourse given by Joseph Smith on June 11, 1843, in Nauvoo, Illinois; reported by Wilford Woodruff and Willard Richards)

A man is his own tormentor and his own condemner. Hence the saying, They shall go into the lake that burns with fire and brimstone [see Revelation 21:8]. The torment of disappointment in the mind of man is as exquisite as a lake burning with fire and brimstone. I say, so is the torment of man. (History of the Church, 6:314, 317; punctuation modernized; from a discourse given by Joseph Smith on Apr. 7, 1844, in Nauvoo, Illinois; reported by Wilford Woodruff, Willard Richards, Thomas Bullock, and William Clayton.)